let the parser return a null object if the content length is 0
let the parser return a null object if the content length is 0

maclover7/rack,wildjcrt/rack,ngpestelos/rack,davidcelis/rack,wildjcrt/rack,davidcelis/rack,liamseanbrady/rack,tylergannon/rack,davydovanton/rack,Eric-Guo/rack,jackxxu/rack,liamseanbrady/rack,deepj/rack,rwz/rack,akihiro17/rack,gioele/rack,jackxxu/rack,supzann3/rack,supzann3/rack,akihiro17/rack,tylergannon/rack,davydovanton/rack,shaneog/rack,gfvcastro/rack,gfvcastro/rack,eins78/rack,nmk/rack,jackxxu/rack,gfvcastro/rack,supzann3/rack,wildjcrt/rack,nmk/rack,gioele/rack,shaneog/rack,eins78/rack,ngpestelos/rack,imtayadeway/rack,wjordan/rack,nmk/rack,rwz/rack,gioele/rack,laplaceliu/rack,keepcosmos/rack,imtayadeway/rack,maclover7/rack,shaneog/rack,imtayadeway/rack,davydovanton/rack,eins78/rack,deepj/rack,liamseanbrady/rack,davidcelis/rack,akihiro17/rack,maclover7/rack,keepcosmos/rack,wjordan/rack,rwz/rack,deepj/rack,Eric-Guo/rack,laplaceliu/rack,laplaceliu/rack,wjordan/rack,keepcosmos/rack,Eric-Guo/rack,tylergannon/rack,ngpestelos/rack